common: Enable warnings as errors

hle: service: ldr: Implement UnloadNrr.

Cleans up common so that we can enable warnings as errors.

async_shaders: Increase Async worker thread count for >8 thread cpus

* Rename to align with switchbrew

* Rename to align with switchbrew and remove gpu function that checks if clearing should be done.

shader/arithmetic: Implement FCMP immediate + register variant

- Used by Final Fantasy X/X-2 HD Remaster.

video_core: unbreak -Werror in NVDEC with Clang

Prevents the compiler tripping up about Windows headers.

src/core/hle/service/nvdrv/devices/nvhost_nvdec_common.cpp:41:15: error: unused variable 'OutOfMemory' [-Werror,-Wunused-const-variable]
constexpr u32 OutOfMemory{static_cast<u32>(-12)};
              ^

General: Make ignoring a discarded return value an error

VP9: Minor interface changes and safety improvements

MSVC lets us fine-tune catching expressions with no side-effects a
little more.

Allows our CI to catch more potential bugs. This also removes the
[[nodiscard]] attribute of IOFile's Open member function. There are
cases where a file may want to be opened, but have the status of it
checked at a later time.

It's deprecated in the language to autogenerate these if the destructor
for a type is specified, so we can explicitly specify how we want these
to be generated.

Prevents values from mistakenly being discarded in cases where it's a
bug to do so.

The API of VP9 exposes a WasFrameHidden() function which accesses this
member. Given the constructor previously didn't initialize this member,
it's a potential vector for an uninitialized read.

Instead, we can initialize this to a deterministic value to prevent that
from occurring.

These helper functions don't directly modify any member state and can be
hidden from view.

externals: Update fmt to 7.1.0

nvdec: Minor tidying up

Adds 1 async worker thread for every 2 available threads above 8

Add hotplug, rumble and fix 3rd party adapters for the GC adapter

kernel/process: Add missing <ctime> include

Fixes compilation on MSVC

web_service: follow-up fix to #4842

kernel: Use the current time as the default RNG seed

sync_manager: Amend parameter order of calls to SyncptIncr constructor

* The web_service http request is now fixed on Windows (R) platform.
* The issue is due to a complicated race-condition in `httplib`, a detailed
  explanation is available at https://github.com/yhirose/cpp-httplib/pull/701
* A pending Pull Request on `httplib` has been applied to remedy the
  said race-condition.
* The socket availability check is removed due to a behavioral chice of
  `httplib` that a socket will not be created before any actual request
  is sent.

web_service: web_backend: Handle socket errors with GenericRequest.

- Fixes a shutdown crash when we try to submit telemetry if there is a service issue.

video_core: cdma_pusher: Add missing LOG_DEBUG field in ExecuteCommand.

service: Update function tables

Trivially add the encoding for this.

externals: Track upstream inih

hle/kernel: Remove unused registered_core_threads to fix data races

common/fiber: Take shared_ptr<Fiber> by copy in YieldTo

tests: Fix data race in fibers test